AMSTRAD PC-CM Service Manual Download | Manualshive

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Summary of Contents for PC-CM

Page 1: ...I PC1512 PERSONAL COMPUTER PC MM MONOCHROME MONITOR PC CM COLOUR MONITOR SERVICE MANUAL ...

Page 2: ...interface with standard connectors Loudspeaker with volume control Battery backed real time clock and configuratioon RAM Socket for 8087 maths co processor Connector for light pen Complete with Colour Monitor or Monochrome Grey Level Monitor The standard built in colour adaptor provides all the following modes Medium resolution Alpha 16 colours 40x45 characters High resolution Alpha 16 colours 80x...

Page 3: ...DON DRIVE THIS INFORMATION APPLIES ONLY TO THE 20MB DRIVES AMSTRAD RESERVES THE RIGHT TO AMMEND THE CIRCUIT OR CHANGE THE COMPONENTS WITHOUT PRIOR WARNING USE RP4 DIAGNOSTICS EXPANSION CARD OR DIAGNOSTIC DISC FOR FAULT FINDINGS FD 3 SERVICE INFORMATION 1 Introduction This section is for the maintenance of DFC222A 1 1 General The floppy disk drive is a high precision equipment and requires the foll...

Page 4: ...it write if medium is changed Y NO Cannot write YES Is write protect seal stuck on medium NO Y YES Write protect sensor has failed Check write protect circuit and its periphery J Is head cord damaged or disconnected V NO Remove seal YES Exchange head Is write gate correctly opened YES _L_ Is setting appropriate YES NO NO Check circuit check system Drive NG stepping motor Check circuit ...

Page 5: ...ES Are errors caused on inner circumference of tracks NO YES Is spindle speed OK NO YES Is index signal correctly sent NO Adjustment YES l Is azimuth azimuth NO Tilting of guide shafts due to shock or heads are defective YES Is seek operation normal NO Check step motor and driving mechanism YES Is time margin of inner circumference tracks sufficient YES A NO YES _ L Change the printed circuit boar...

Page 6: ...e MC3470AP Change printed circuit board V NO V Over speeding YES Check motor control printed circuit board Is servo cord disconnected from motor V Is index sent YES Index sensor is faulty Adjust NO V NO Change motor alignment 3l Read circuit has a problem Exchange MC3470AP Change printer circuit board XL Operating normally Possibility of or head cord trouble Adjust X Adjust V Can it be adjusted V ...

Page 7: ...head to the previous track 3 Repeat Step 1 4 Errors that cannot be recovered after taking these steps cannot be recovered 3 3 Write Error Operate READ AFTER WRITE if an error occurs during the write operation If the error cannot be recovered after operating READ AFTER WRITE more than four times operate READ AFTER WRITE on another track to determine whether the diskette or drive is responsible for ...

Page 8: ...2 Lever Exchange See Figure 4 2 4 2 1 Lever Removal a Set the lever horizontally b Unfasten the fix screw of the lever c Pull the lever forward 4 2 2 Lever Mounting a Place the wide part of the lever cam on the hub side and check that the lever shaft hole can be seen from above Hub open state b Set the lever horizontally and insert from the front c Secure the lever with a screw 4 3 Front Plate Exc...

Page 9: ...tepping motor assembly mount the metal belt and keep plate with screws b Align the oval hole of the stepping motor mounting plate with the guide pin and mount the stepping motor assembly with two screws Temporary tightening of screws are required c Pull the tip of the metal belt and mount the metal belt on the tip of the head assembly with a screw d Move the head assembly back and forth and check ...

Page 10: ...3 and index burst time 5 5 and check the azimuth 5 4 level 5 6 resolution 5 7 symmetry 5 8 and write protect sensor 5 9 after mounting 4 9 Track Sensor Assembly Exchange See Figure 4 9 4 9 1 Track Sensor Assembly Removal a Remove the printed circuit board as described in 4 1 1 b Unfasten the track sensor assembly fix screw c Remove the track sensor assembly 4 9 2 Track Sensor Assembly Mounting and...

Page 11: ...diskette b Move the head to Track 1 6 and check the cat s eye waveforms of the top and bottom heads c Adjust as follows if one of the top or bottom heads is not more than 75 in an amplitude ratio of two waveforms d Slightly loosen the fix screws of the stepping motor assembly and move the stepping motor assembly back and forth to adjust the amplitudes The amplitudes of two waveforms should be near...

Page 12: ...ms div A Step Signal TK Signal 2TK 1TK QTK 1TK 2TK Direction J 5 4 Azimuth Check a Insert a CE diskette b Move the head to Track 34 and check that the azimuth waveforms of the top and bottom heads are as described in Figure 5 4 c Exchange the head assembly if the azimuth of one of the top and bottom heads is not as shown in Figure 5 4 Measuring Conditions Channel 1 TP1 10mV div MODE ADD Channel 2 ...

Page 13: ...ea d Reading Output Si T P I T 1 00 00jj s 270mV 5 6 Level Check a Insert a blank diskette b Move the head to Track 39 and write 2F by the top and bottom heads c Check that the average output level of the top and bottom heads is more than Perform the following if the output level is below the required standard d Insert another blank diskette and reconfirm e Check the spindle speed as described in ...

Page 14: ...Move the head to track and write 1 F by the top and bottom heads Measuring Conditions Channel 1 TP5 0 1V div MODE CH1 Trigger INT CH1 Sweep 0 5ms div Slope T 400 ns or less If you have individual spec this item obey your spec 5 9 Write Protect Sensor Check Load and unload a diskette and check that write protect sensing is definitely made using Brikon 5 10 Head Cleaning Check for excessive dust or ...

Page 15: ...FD 3 EXPLODED VIEW THIS DRAWING REFERS TO ALL THOSE DESCRIBED IN THE TEXT J 5 15 ...

Page 16: ...16 ...

Page 17: ...17 ...

Page 18: ... 171614 VR403 VRSF 10kohm 171615 VR404 VRSF2kohm 171616 VR405 VRSF 100kohm 171617 VR501 VRSF 5KO 171618 VR502 505 507 VRSF 1kohm 171619 Switch SW501 l Power On Off Switch 171511 Circuit Reference Description Part No Coils Transform ers L201 CoreTridal L201 171557 L401 Coil Linearity 171558 L402 Coil Inductor 171559 L501 Coil Line Filter AC 171502 L502 Coil 171560 L503 Coil 171504 L506 Coil Core Tr...

Page 19: ... 171397 UPD4126C 15 IC131 133 171398 AMS40044 IC132 171578 MC146818P IC134 171399 MN41256 15 IC135 152 171400 LA4140 IC401 170111 AMS40042 IC801 171401 TC74HC14P IC802 171033 Description Circuit Reference Part No Transistors 2SC1815Y 2SA1015Y KTC2120 Q101 102 105 Q103 104 106 107 Q1 08 1 13 170447 170453 170113 Switches SW801 Switch Key Board 171409 Variable Resistors VR401 Volume Control CPU Unit...

Page 20: ... Part No Polyester Capacitors 0 1ur 100V C404 1400237 Electrolytic Capacitors 1UF 250V C440 171647 10uF 100V C509 171648 22uF 250V C436 171649 150uF 400V C506 601 171650 220uF 160V C515 171651 330uF 25V C613 171652 470uF 35V C516 171653 1000uF 16V C623 1422158 1000uF 35V C437 1522159 2200uF 35V C408 1422160 3300UF 16V C621 622 171654 3300uF 35V C618 171655 Metal Polypropylene Capacitors 0 0082 uF ...

Page 21: ...CABINET DIAGRAM EXPLODED VIEW 21 ...

Page 22: ...CPU P C B ASSEMBLY COI MC0033B ELC4762 94V 0 if S ss is n 38 sit otoa 22 ...

Page 23: ...BLY COMPONENT SIDE 1HHH 1 K 5 32B 6LC 762 94V 0 23 ...

Page 24: ...Shield Top 171689 14 Plate Shield Bottom 171690 15 F D Drive A B 171576 17 Knob Volume 171362 18 Speaker 171370 19 Fan HD Unit 171665 21 Top Cabinet Keyboard 171354 22 Switch Key Board 171409 23 Keyboard PCB 171412 24 Cabinet Bottom Assembly 171355 25 Stand Keyboard 171358 26 Washer 171659 27 Cord 6 Pin DIN Keyboard 171420 Cabinet Front Assembly HD10 171660 Cabinet Front Assembly HD20 171661 HD10 ...

Page 25: ...nd insert disc 5 the maroon disc 9 Nowtypeconfig RETURN Thisprocedurewillcopyallfivediscs order5 1 2 3 4 ontc h had Once finished the screen willshowsomeinformationaboutthesizeofthediscandthenumb f nd directories present 1 0 To now use the hard disc remove the floppy disc from the driveand store in a safe place wi e four discs then restart the computer by pushing Alt Ctrl and Del 1 1 After a short...

Page 26: ... forward 6 V Size setting Load diagnostics in PC1512 Monitor screen Adjust VR404 so the border is 1 2mm 3mm all around Set optimum Brightness Contrast setting 7 Sub Brightness Control Load Diagnostics in PC1512 Monitor Screen Set VR 102 2 to max adjustment VR101 so the grey level wave form is 27 when initial white level is 100 against black scope Q302 collector 1 Refer to Fig 2 8 Sub Contrast Cont...

Page 27: ...d 12 0V 0 05V 1 Refer to Fig 3 2 Prevent short circuit when pulling the PCB forward 7 Centering the Screen Screen On Observe Screen Adjust DY and 4 Pole Magnets to get 12mm 3mm Border 1 Refer to Fig 3 8 V Size Cont Screen On Observe Screen Adjust VR403 to get Circle 1 Refer to Fig 4 9 V Linearity Adjustment Screen On Observe Screen Adjust VR404 to get E F Equal 1 Refer to Fig 4 10 Cut Off Adjustme...

Page 28: ...C0COCOCD O O OC0C0T C0 oic Jh coT c jcomtD m 2 g t 5 CD 5 fi 1 t OT Eot3S E 5 2 re a U_ CD O 0 Q 5 28 ...

Page 29: ...et Back 171545 55 CRT 340AXBWDN 171575 56 CRT Socket 171567 57 Metal Washer 171580 58 CRT Spacer 171581 59 Stand Bottom 171461 60 Stand Top Spacer 171463 61 Holder Stand 171462 62 Frame Bottom 171543 63 Button Push 171469 64 Knob Volume 171362 65 8 Pin DIN Cord 171522 66 14 Pin DIN Cord 171519 43 Screw Tap Tite o Q cc o Q I UJ z GO o 29 ...

Page 30: ...CH 30 ...

Page 31: ... VMA3 VMA2 VMA1 VMAO i r Tr I CI 27 AMS ROM 40045 o cm m o a L if l C i i i DT QE SC DUAL PORT D RAM LCI 31 A7 25GK AG 4I2G4 1S AS 1 lD 01 CD CM I 8 1 wy in vxsun RAS CAS WB7 WE SOE DT OE SC DUAL PORT 0 RAM IC133 A 25GK AG A5 412G4 1S A4 A3 N w w H I I I I 12 3 CAUTION SINCE THESE PARTS MARKED BY ZJJ ARE CRITICAL FOR SAFETY USE ONES DESCRIBED ON PARTS LIST ONLY ATTENTION U ES PIECES REPAREES PAR U...

Page 32: ...CHi i30 3237A 5 DMA 1 Z O _1 IQj EISIir till uluii h C X o o J U U U UJ U LJ i en a a tz 2 O Q Q H Q Q 2 d 3 2 i T t I C 1 09 3259A 2 PIC IS IB f V ci 14 8253 5 PIT 3 3 SOOli lIO d m ajS tMD S 32 ...

Page 33: ...I22 l Yi 74LS373 BA7 r 9 A7 BAG 8 2 46 BAG 13 AG BA4 6 14 A4 1 PA3 15 5 A3 3A2 4 l 16 A2 s BA1 3 Al L BAQ 2 18 AO CI 21 X BADI 1 TO NRIOG 4K7 1 A n 244 OUTPUT BUFFER PACKAGE ENABLES A20 A2 A22 A23 A24 A2G A2G A27 A28 A03 A04 IRQ2 IRQ3 1RQ4 RQS iRQG I IR07 NDACKO LCI 15 J 5244 P C NDACK 1 4 IG NDACK2 c NDACK3 DRQ1 DRQ2 DRQ3 BQ2 B28 B20 B27 At I B04 B2G B24 B23 B22 5V 1 o ov GV 12V AOI AID B09 B03 B...

Page 34: ...X V N PRTSCkR 2 i X8 F7 Z c M ilGHT o END 3 PGDN DEI X7 XG FG A D G J Q 5 INS XG X5 FG CTR1 G F H K CAPS LOOK X5 F4 Q G T U 7 HOME 9 PGUP SPACE X3 FG R Y P ALT X3 X2 F2 3 5 7 9 SCROLL LOCK F10 X2 F ESC 5 2 X o NUM LOCK ENTER FG XI Y2 Y3 YS ys r9 t 2 KEYGOARD SW80 1 ESU 243S 34 ...

Page 35: ...RADS FDR CURLY CABLE TERMINATION J801 JOYSTICK 9 WAY D TYPE PLUG 35 ...

Page 36: ...KEYBOARD EXPLODED DIAGRAM 36 ...

Page 37: ...ATIC C 1AAJU AC IN 24DV 50HZ 4 CAUTION SINCE THESE PARTS MARKED BY A AR CRITICAL FOR SAFETY USE ONES DESCRIBED ON PARTS LI ST ONLY ATTENTION _ES PIECES REPAREE DANGEREUSES AN PO N UTILISER QUE CEI DANS LA NOMENCLATl ...

Page 38: ...ITOR r 12 IECES REPAREES PAR UN A ETAN 3EUSES AN POINT DE VUE SECURITE ISER QUE CELLES DECRITES A NOMENCLATURE DES PIECES NOTE THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE 37 ...

Page 39: ...CHASSIS SCHEMATII 38 ...

Page 40: ...LECT DRIVE SELECT 1 MOTOR ON WRITE DATA DIRECTION TN t SIDE SELECT NIOR 2 NIOW 3 NFDCS BAO 5 BADIS 13 BAD14 12 BAD 13 BADI2 10 c BAD1 I 9 k BAD 10 B BAD9 k BAD8 S CD 102 FDD 34 WAY CONN CD101 DRIVE 1 DOWER CD 104 DRIVE 2 POWER CP105 DRIVE 3 POWER ATTENTION l LS PIECES REPAREES PAR UN ETANT DANGEREUSES AN POINT DE VUE SECURITE NUTILISER QUE CELLES DECRITES DANS LA NOMENCLATURE DES PIECES CAUTION SI...

Page 41: ...IN JD50 POWER DIN PIN SOCKET _ 3 J 12 4 10 9 ir i o l 1t 3 s a T _ Taos 4 i 1 1 POWER LED DS03 TLS134A bl X sv 12V DE02 DS44 2X BTlg LES PIECES REPAREES PAR UN A ETANT DANGEREUSES AN POINT DE VUE SECURITE N UTILISER QUE CELLES DECRITES DANS LA NOMENCLATURE DES PIECES CAUTION SINCE THESE PARTS MARKED BY A ARE CRITICAL FOR SAFETY USE ONES DESCRIBED ON PARTS LIST ONLY ...

Page 42: ... 5 _ BAD 16 3AD9 L_ BAD8 8 B 3 n o I I BUSY O 10 ACK O 12 PE o 13 SLCT O 15 ERROR m o 21 GND 22 GND I 23 GND J o 24 GND P P l O 25 GND JD1Q2 PRINTER 25 WAV D SUB CONN JP101 SERIAL PORT 2S WAY D SUB CONN THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE 39 ...

Page 43: ... 1 9 2 3 9 O 0l s 0 8 3 3 FROM 12V B CAUTION SINCE THESE PARTS MARKED BY A ARE CRITICAL FOR SAFETY USE ONES DESCRIBED ON PASTS LIST ONLY ATTENTION i_LS PIECES REPAREES PAR UN A ETANT DANGEREUSES AN POINT DE VUE SECURITE M UTILISER QUE CELLES DECRITES DANS LA NOMENCLATURE DES PIECES ic e rnis schema CF orintING 40 ...

Page 44: ...V 9 12 V P P V CD403 1 22G04 J i 1 A r r DY401 Q27101 1403 CD4D2 i 22G02 SAP 3 i C3001 GO i 8 A MO J I TOR DISPLAY TUBE V80I 340AXBWDN THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME CF PRINTING AND SUBJECT TC CHANGE WITHOUT NOTICE 1 4821 ...

Page 45: ...V SOFZ 7FEE r I 20 Lb3DCC9 IN J S PIECES REPAREES PAR UN E TANT DANGEREUSES AN POINT DE VJE SECURITE N UTILISER QUE CELLES DECRITES DANS LA NOMENCLATURE DES PIECES CAUTION SINCE THESE PARTS MARKED BY A ARE CRITICAL TOR SAFETY USE ONES DESCRIBED CN PARTS LIST ONLY ...

Page 46: ...HC DIAGRAM PC CM POWER SUPPLY SV J GNO rn END 55 2V CD502 8GE8900I GN3 END gndF svg 5V PJ 41 ...

Page 47: ...G 8 S R233 r04 a pjQ MSlfli xpc I 1 PTN0 Z70306 n i R231 ft R228 0805 1 oca C405 JJISIg R221 g S R2I4 7 R2 12 1 i T I C414 5fi6 2 _ o i S C408 H C4H C412 i si 1 3 ffi O C5 9 i fl UUO R42 C426 3 IT 3 I5A 1 F50I csos cr J3 If 3 SW501 f 3 BLUE rem CSCB W 0KB K04 H J 42 ...

Page 48: ... C B COMPONENT LAYOUT XPC FR 1 1V 0 MJ XPC FR 1 Z7030S 1V 0 BS29 Sr 0619 osn W SI 31 s RS32 B lg J jB i J8 SSK i w l n m i T o ...

Page 49: ...PC CM MAIN P C B COMPONENT LAYOUT bright 5 3 2 VRI04 XB a jj R C622 i i T v R1 i mo VR102 I ...

Page 50: ...9 Ift C423 S HH J I f 1 I o n C441 M l ft R422 n I o n L 1 r I w I R413 I I 1212 Si 2 I TSTS 3 T TJtot f glpspll R 29 yBF R4I8 C402 i ffljj PTN0 Z70304 5 gf jzT i TO 904 fiND HI pB co t 1 0 g co cog i L804 W1 CRT P C B COLOUR MONITOR 43 ...

Page 51: ...SCHEMATIC DIAGRAM e 44 ...

Page 52: ... IAGRAM FD 3CPU AT XTAL1 f TC2E TC2A TC1B TC1A t CD U llj 3 Z CL W a a u u J CE S f tn 3 3 to o XXX X 3rx1ht T VTl o 52 x _ 5 o in J h Z 3 j_C JjJ Go o UJt 1 xai LJf Z UJ2 K3 3LJ as to ZtO era 3 ...

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